Which of the following reagents produce `ClO_2` ?
A. `Cl_2 + HgO to `
B. `Cl_2 + O_2 to `
C. `NaClO_3 + I_2 to `
D. `NaClO_3 + SO_3 + H_2SO_4 to `

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Correct Answer - D
`NaClO_3 + SO_3 + H_2SO_4 to 2ClO_2 + 2NaHSO_4`

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